Scientists who study arthropods throughout the world make use of scientific names. The scientific name consists of two words, the genus name and the species name and is referred to as a binomial. This system for naming species is known as binomial nomenclature. Special rules apply to scientific names. These names are always written in italics or underlined. The author's name comes after the binomial and is not italicized. The author was or is the first person to describe the species. The scientific name of the housefly is written as Musca domestica Linn. The famous scientist Carolus Linnaeus was the first person to describe this species.